EP2837705A1 - Tôle d'acier laminée à chaud à teneur élevée en carbone présentant une excellente uniformité et son procédé de fabrication - Google Patents

Tôle d'acier laminée à chaud à teneur élevée en carbone présentant une excellente uniformité et son procédé de fabrication Download PDF

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Publication number
EP2837705A1
EP2837705A1 EP20120873979 EP12873979A EP2837705A1 EP 2837705 A1 EP2837705 A1 EP 2837705A1 EP 20120873979 EP20120873979 EP 20120873979 EP 12873979 A EP12873979 A EP 12873979A EP 2837705 A1 EP2837705 A1 EP 2837705A1
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EP
European Patent Office
Prior art keywords
weight
steel sheet
hot rolled
rolled steel
high carbon
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20120873979
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German (de)
English (en)
Other versions
EP2837705A4 (fr
EP2837705B1 (fr
EP2837705B9 (fr
Inventor
Young-Roc Im
Jea-Chun Jeon
Byoung-Ho Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP2837705A1 publication Critical patent/EP2837705A1/fr
Publication of EP2837705A4 publication Critical patent/EP2837705A4/fr
Publication of EP2837705B1 publication Critical patent/EP2837705B1/fr
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Publication of EP2837705B9 publication Critical patent/EP2837705B9/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

Definitions

  • the present disclosure relates to a high carbon hot rolled steel sheet having excellent material uniformity, and more particularly, to a high carbon hot rolled steel sheet having excellent material uniformity that may be used in machine parts, tools, automobile parts, and the like, and a method for manufacturing the same.
  • High carbon hot rolled steel sheets may require excellent material uniformity because high material deviations in the high carbon hot rolled steel sheets not only worsen dimensional precision in a forming process and cause defects during processing, but also lead to nonuniform structure distribution even in a final heat treatment process.
  • patent document 1 related to the formability of a high carbon annealed steel sheet obtained after performing cold rolling and annealing discloses that the formability of the steel sheet is improved if a carbide distribution, in which an average carbide particle diameter is 1 ⁇ m or less and a fraction of carbides having a particle diameter of 0.3 ⁇ m or less is 20% or less, is obtained by controlling annealing conditions.
  • a carbide distribution in which an average carbide particle diameter is 1 ⁇ m or less and a fraction of carbides having a particle diameter of 0.3 ⁇ m or less is 20% or less, is obtained by controlling annealing conditions.
  • carbides do not necessarily have to be formed to have a particle diameter of 1 ⁇ m or less after annealing a hot rolled steel sheet having excellent formability.
  • Patent document 3 discloses that fine blanking workability increases when ferrite grain sizes satisfy a range of 10 ⁇ m to 20 ⁇ m while maintaining fractions of pearlite and cementite to levels of 10% or less.
  • the disclosed invention specifies the controlling of the microstructure of an annealed steel sheet, the formability of the disclosed invention is far from that of a hot rolled structure.
  • a method of improving the formability of a hot rolled structure if the formation of ferrite is suppressed and a uniform phase distribution is obtained, material deviations may be minimized.
  • a high carbon hot rolled steel sheet may include 0.2% by weight to 0.5% by weight of C, more than 0% by weight to 0.5% by weight of Si, 0.2% by weight to 1.5% by weight of Mn, more than 0% by weight to 1.0% by weight of Cr, more than 0% by weight to 0.03% by weight of P, more than 0% by weight to 0.015% by weight of S, more than 0% by weight to 0.05% by weight of Al, 0.0005% by weight to 0.005% by weight of B, 0.005% by weight to 0.05% by weight of Ti, more than 0% by weight to 0.01% by weight of N, and the balance of Fe and unavoidable impurities.
  • C is contained in an amount range of 0.4% by weight to 0.5% by weight, although processing is relatively difficult in forming processes, abrasion resistance and fatigue resistance of the high carbon hot rolled steel sheet are excellent due to a high degree of hardness of the steel sheet after final heat treatment, and thus the steel sheet may be usefully used for manufacturing groups of machine parts operating in high load conditions.
  • Phosphorous (P) is an impurity element in the steel sheet. It may be preferable to set the upper limit of the content of P to be 0.03% by weight. If P is contained in an amount of more than 0.03% by weight, the weldability of the steel sheet may be deteriorated, and the steel sheet may become brittle.
  • sulfur (S) is an impurity element worsening the ductility and weldability of the steel sheet. Therefore, it may be preferable to set the upper limit of content of S to be 0.015% by weight. If S is contained in an amount of more than 0.015% by weight, the possibility of lowering the ductility and weldability of the steel sheet is increased.
  • Al more than 0% by weight to 0.05% by weight
  • Boron (B) is an element greatly contributing to securing hardenability of the steel sheet and thus may be added in an amount of 0.0005% by weight or more to obtain a hardenability-reinforcing effect.
  • B is added in an excessive amount, boron carbide may be formed on grain boundaries to form nucleus forming sites and rather worsen hardenability. Therefore, it may be preferable to set the upper limit of the content of B to be 0.005% by weight.
  • the heating of the slab is a heating process for smoothly performing a succeeding rolling process and sufficiently obtaining target physical properties of a steel sheet, the heating process is carried out within a proper temperature range to obtain target physical properties.
  • the hot rolled steel sheet When cooling the hot rolled steel sheet, the hot rolled steel sheet is cooled in a water-cooling ROT until the temperature of the steel sheet reaches 550°C from the finish hot rolling temperature.
  • the steel sheet is cooled at a cooling rate CR1 lower than 100 °C/sec but equal to or higher than Cond1 as represented by Formula 1 below. If the cooling rate CR1 is lower than the Cond1 calculated by Formula 1 below, a ferrite phase is formed during cooling, resulting in a hardness difference of 30 Hv or greater. On the other hand, if the cooling rate CR1 exceeds 100 °C/sec, the shape of the steel sheet deteriorates markedly.
  • a pearlite phase may be formed to an area fraction of 75% or more prior to a coiling process. If a pearlite phase is formed to an area fraction of 75% or more before a coiling process, the area fraction of the pearlite phase in the steel sheet may become 95% or more after the coiling process.
  • the measured interlamellar spacings were all 0.1 ⁇ m or less. Therefore, it was confirmed that very fine structures were formed.
EP12873979.4A 2012-04-10 2012-12-27 Tôle d'acier laminée à chaud à teneur élevée en carbone présentant une excellente uniformité de matériau et son procédé de fabrication Active EP2837705B9 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20120037318A KR101417260B1 (ko) 2012-04-10 2012-04-10 재질 균일성이 우수한 고탄소 열연강판 및 이의 제조방법
PCT/KR2012/011643 WO2013154254A1 (fr) 2012-04-10 2012-12-27 Tôle d'acier laminée à chaud à teneur élevée en carbone présentant une excellente uniformité et son procédé de fabrication

Publications (4)

Publication Number Publication Date
EP2837705A1 true EP2837705A1 (fr) 2015-02-18
EP2837705A4 EP2837705A4 (fr) 2016-01-20
EP2837705B1 EP2837705B1 (fr) 2019-03-13
EP2837705B9 EP2837705B9 (fr) 2019-07-17

Family

ID=49327790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12873979.4A Active EP2837705B9 (fr) 2012-04-10 2012-12-27 Tôle d'acier laminée à chaud à teneur élevée en carbone présentant une excellente uniformité de matériau et son procédé de fabrication

Country Status (8)

Country Link
US (1) US9856550B2 (fr)
EP (1) EP2837705B9 (fr)
JP (1) JP5978388B2 (fr)
KR (1) KR101417260B1 (fr)
CN (1) CN104220618B (fr)
ES (1) ES2731498T3 (fr)
IN (1) IN2014DN08376A (fr)
WO (1) WO2013154254A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3561118A4 (fr) * 2016-12-20 2019-10-30 Posco Tôle d'acier de résistance élevée ayant d'excellentes caractéristiques d'allongement à haute température, élément pressé à chaud, et procédés de fabrication pour ladite tôle et ledit élément

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101849760B1 (ko) * 2016-09-28 2018-04-17 주식회사 포스코 고탄소 강판 및 이의 제조방법
WO2021176999A1 (fr) * 2020-03-02 2021-09-10 日本製鉄株式会社 Tôle d'acier laminée à chaud
WO2023026582A1 (fr) * 2021-08-24 2023-03-02 日本製鉄株式会社 Plaque d'acier laminée à chaud

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3561118A4 (fr) * 2016-12-20 2019-10-30 Posco Tôle d'acier de résistance élevée ayant d'excellentes caractéristiques d'allongement à haute température, élément pressé à chaud, et procédés de fabrication pour ladite tôle et ledit élément
US11680305B2 (en) 2016-12-20 2023-06-20 Posco Co., Ltd High strength steel sheet having excellent high-temperature elongation characteristic, warm-pressed member, and manufacturing methods for the same

Also Published As

Publication number Publication date
US20150107725A1 (en) 2015-04-23
IN2014DN08376A (fr) 2015-05-08
KR20130114902A (ko) 2013-10-21
US9856550B2 (en) 2018-01-02
CN104220618B (zh) 2017-02-22
ES2731498T3 (es) 2019-11-15
EP2837705A4 (fr) 2016-01-20
JP2015515548A (ja) 2015-05-28
EP2837705B1 (fr) 2019-03-13
KR101417260B1 (ko) 2014-07-08
EP2837705B9 (fr) 2019-07-17
CN104220618A (zh) 2014-12-17
WO2013154254A1 (fr) 2013-10-17
JP5978388B2 (ja) 2016-08-24

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